This boards contains a Cortex M4 STM32G491xC microcontroller with a top speed of 170 MHz.

The MCU has 512 KB of program flash, and 112 KB of RAM.

STLINK on this board does not work on a USB1.1 hub.

The target can be programmed using STLINK on-board or via PA13 and PA14 with the STLINK/V3 held in reset with JP1 and power set to 5V charger.


The Arduino headers are almost compatible, the main difference being that D14/D15 are not the same I/O as AD4/AD5 by default.

Arduino compatible headers

                 PB8  D15 I2C1 SCL  (AF4)
                 PB9  D14 I2C1 SDA  (AF4)
NC                    GND
IOREF        LD2 PA5  D13 SPI1 SCK  (AF5)
RESET            PA6  D12 SPI1 MISO (AF5)   
3V3              PA7  D11 SPI1 MOSI (AF5)
5V               PB6  D10      CS
GND              PC7  D9
GND              PA9  D8
VIN    B1 PC13
                 PA8  D7
                 PB10 D6
AD0 PA0          PB4  D5
AD1 PA1          PB5  D4
AD2 PA4          PB3  D3
AD3 PB0          PA10 D2
AD4 PC1/PB9  PC4/PA2  D1  USART1 TX (PC4 AF7)
AD5 PC0/PA15 PC5/PA3  D0  USART1 RX (PC5 AF7)


CN10 35 PA2  TX
CN10 37 PA3  RX
CN7  13 PA13 SWDIO
CN7  15 PA14 SWCLK


st-info --probe
Failed to parse flash type or unrecognized flash type
Found 1 stlink programmers
  version:    V3J9
  serial:     004A00263331511734333834
  flash:      524288 (pagesize: 2048)
  sram:       114688
  chipid:     0x479
  dev-type:   STM32G49x_G4Ax
openocd -f "interface/stlink.cfg" -c "transport select hla_swd" -f "target/stm32g4x.cfg"
Open On-Chip Debugger 0.12.0-rc2+dev-00028-g9501b263e (2022-12-15-23:13)
Licensed under GNU GPL v2
For bug reports, read
Info : The selected transport took over low-level target control. The results might differ compared to plain JTAG/SWD
Info : Listening on port 6666 for tcl connections
Info : Listening on port 4444 for telnet connections
Info : clock speed 2000 kHz
Info : STLINK V3J9M3 (API v3) VID:PID 0483:374E
Info : Target voltage: 3.321600
Info : [stm32g4x.cpu] Cortex-M4 r0p1 processor detected
Info : [stm32g4x.cpu] target has 6 breakpoints, 4 watchpoints
Info : starting gdb server for stm32g4x.cpu on 3333
Info : Listening on port 3333 for gdb connections
Info : accepting 'gdb' connection on tcp/3333
[stm32g4x.cpu] halted due to debug-request, current mode: Thread
xPSR: 0x81000000 pc: 0x0800263c msp: 0x20002228
Info : device idcode = 0x10016479 (STM32G49/G4Axx - Rev 'unknown' : 0x1001)
Info : RDP level 0 (0xAA)
Info : flash size = 512 KiB
Info : flash mode : single-bank
Info : device idcode = 0x10016479 (STM32G49/G4Axx - Rev 'unknown' : 0x1001)
Info : RDP level 0 (0xAA)
Info : OTP size is 1024 bytes, base address is 0x1fff7000
(gdb) set arch arm
The target architecture is assumed to be arm
(gdb) target extended-remote localhost:3333
Remote debugging using localhost:3333
warning: No executable has been specified and target does not support
determining executable automatically.  Try using the "file" command.
0x0800263c in ?? ()
(gdb) info reg
r0             0x37f               895
r1             0x0                 0
r2             0x0                 0
r3             0x2000000c          536870924
r4             0x3e9               1001
r5             0x25641             153153
r6             0x0                 0
r7             0x0                 0
r8             0x0                 0
r9             0x0                 0
r10            0x0                 0
r11            0x0                 0
r12            0xc00               3072
sp             0x20002228          0x20002228
lr             0x80033bf           134230975
pc             0x800263c           0x800263c
xPSR           0x81000000          -2130706432
fpscr          0x2000000           33554432
msp            0x20002228          0x20002228
psp            0x0                 0x0
primask        0x0                 0
basepri        0x0                 0
faultmask      0x0                 0
control        0x4                 4


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